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ThreadInfo provides a uniform interface to collect register sets or the thread-local storage address across bitness for x86 and ARM family architectures. Additionally, ThreadInfo.h defines context structs which mirror those provided in sys/user.h. This allows tracing across bitness as the structs in sys/user.h are only provided for a single target architecture. Bug: crashpad:30 Change-Id: I91d0d788927bdac5fb630a6ad3c6ea6d3645ef8a Reviewed-on: https://chromium-review.googlesource.com/494075 Commit-Queue: Joshua Peraza <jperaza@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org>
101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/linux/thread_info.h"
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#include "build/build_config.h"
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#include "gtest/gtest.h"
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#include "test/multiprocess.h"
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#include "util/file/file_io.h"
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#include "util/misc/from_pointer_cast.h"
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namespace crashpad {
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namespace test {
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namespace {
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class SameBitnessTest : public Multiprocess {
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public:
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SameBitnessTest() : Multiprocess() {}
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~SameBitnessTest() {}
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private:
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void MultiprocessParent() override {
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LinuxVMAddress expected_tls;
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CheckedReadFileExactly(
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ReadPipeHandle(), &expected_tls, sizeof(expected_tls));
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ThreadInfo thread_info;
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ASSERT_TRUE(thread_info.Initialize(ChildPID()));
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#if defined(ARCH_CPU_64_BITS)
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const bool am_64_bit = true;
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#else
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const bool am_64_bit = false;
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#endif // ARCH_CPU_64_BITS
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EXPECT_EQ(thread_info.Is64Bit(), am_64_bit);
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ThreadContext thread_context;
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thread_info.GetGeneralPurposeRegisters(&thread_context);
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#if defined(ARCH_CPU_X86_64)
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EXPECT_EQ(thread_context.t64.fs_base, expected_tls);
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#endif // ARCH_CPU_X86_64
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FloatContext float_context;
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EXPECT_TRUE(thread_info.GetFloatingPointRegisters(&float_context));
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LinuxVMAddress tls_address;
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ASSERT_TRUE(thread_info.GetThreadArea(&tls_address));
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EXPECT_EQ(tls_address, expected_tls);
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}
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void MultiprocessChild() override {
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LinuxVMAddress expected_tls;
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#if defined(ARCH_CPU_ARMEL)
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// 0xffff0fe0 is the address of the kernel user helper __kuser_get_tls().
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auto kuser_get_tls = reinterpret_cast<void* (*)()>(0xffff0fe0);
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expected_tls = FromPointerCast<LinuxVMAddress>(kuser_get_tls());
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#elif defined(ARCH_CPU_ARM64)
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// Linux/aarch64 places the tls address in system register tpidr_el0.
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asm("mrs %0, tpidr_el0" : "=r"(expected_tls));
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#elif defined(ARCH_CPU_X86)
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uint32_t expected_tls_32;
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asm("movl %%gs:0x0, %0" : "=r"(expected_tls_32));
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expected_tls = expected_tls_32;
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#elif defined(ARCH_CPU_X86_64)
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asm("movq %%fs:0x0, %0" : "=r"(expected_tls));
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#else
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#error Port.
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#endif // ARCH_CPU_ARMEL
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CheckedWriteFile(WritePipeHandle(), &expected_tls, sizeof(expected_tls));
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CheckedReadFileAtEOF(ReadPipeHandle());
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}
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DISALLOW_COPY_AND_ASSIGN(SameBitnessTest);
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};
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TEST(ThreadInfo, SameBitness) {
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SameBitnessTest test;
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test.Run();
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}
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// TODO(jperaza): Test against a process with different bitness.
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} // namespace
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} // namespace test
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} // namespace crashpad
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